Fix: WhileStmt body pop crashes on empty result stack

[yuvimittal]

Summary

After visiting the loop body, the code unconditionally calls self.result_stack.pop() and then checks if not body_val. If the body visits a void-returning statement (e.g. a bare assignment or a print), nothing is pushed and the pop raises IndexError.

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Expected Results

Actual Results

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IRx version

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[omsherikar]

hii, @yuvimittal Can I work on it?

[yuvimittal]

@omsherikar , yeah sure... assigned it to you

[omsherikar]

hii, @yuvimittal i am going to replace 3 raw .pop() calls with safe_pop() and add a regression test with a void loop body.